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replaced control and gas cap stil shows po455 and po 1448

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po455 and po1448 / replaced evap control and gas cap code still there...what next ? solenoid ? pressure switch ??

Vehicle: 03 nissan pathfinder le 3.5 L

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have you checked to see if there are any broken, cracked, loose or blocked hoses? if not start with that than you can test the solenoid/valve with the instructions below 

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Had a code PO442, replaced gas cap, now I've progressed to PO455
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